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Detecting Calcified stones and cracks in tooth

I had a dental problem when my first molar broke some months ago and after some decay and pain I am undergoing a dental treatment. The doctor was performing a root canal and kept on talking about ...
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Can germs develop surfactant resistance in a harmful way?

Germs can develop antimicrobial resistance. It is a problem serious enough to deserve an FAQ page on the WHO website (http://www.who.int/mediacentre/factsheets/fs194/en/). But how about surfactant ...